When a spawner's delay is 0 and someone right clicks it with a spawn egg, it will spawn the egg's mob, set the delay like it just spawned something, and fail to save the new id. When delay is not 0, right clicking works fine.
When a spawner's delay is 0 and someone right clicks it with a spawn egg, it will spawn the egg's mob, set the delay like it just spawned something, and fail to save the new id. When delay is not 0, right clicking works fine.
A similar issue was fixed recently. Is this still an issue in 15w44b? If so, please explain the issue in detail and provide steps to reproduce it. Please also update the list of affected versions.